Back massage tool



FIG. 1 is a perspective view of a back massage tool showing the new design.

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The broken lines in the drawings are for the purposes of illustrating portions of the back massage tool, which form no part of the claimed design. 

CLAIM The ornamental design for a back massage tool, as shown and described. 